Electric toothbrush head

Abstract

The invention discloses an electric toothbrush head which comprises a brush cylinder, a brush head connecting piece connected in a cavity in the lower end of the brush cylinder and a bristle part located at the front end of the brush cylinder, a second connecting cavity used for being connected with an electric toothbrush driving rod is formed in the middle of the brush head connecting piece, and an elastic component is arranged at the lower end of the second connecting cavity. The side face, making contact with the driving rod, of the elastic component is provided with a clamping brim used for being connected with the driving rod in a clamped mode, the whole second connecting cavity is cylindrical, and a fastening block used for preventing the driving rod from rotating is arranged at the position, making contact with the upper end of the driving rod, of the upper end of the second connecting cavity. The brush head is simple in structure and has a good plugging effect.

Description

[0001] This application is a divisional application of the invention patent application filed on March 25, 2019, with application number 201910229564.5, entitled "An Electric Toothbrush Head". Technical Field

[0002] This invention relates to the field of electric toothbrush technology, and more specifically to the field of toothbrush heads. Background Technology

[0003] Braun GmbH (Patentee), November 6, 2004 (Application Date), CN1882291B (Authorization Announcement No.), Brush Part for Electric Toothbrush (Patent Title). This patent discloses a brush head for an electric toothbrush, in which a first spring element and a second spring element are arranged inside the brush head cavity to clamp a drive rod in the handle, thereby providing sufficient clamping force between the brush head and the drive rod.

[0004] The two spring elements in the disclosed solution are prone to damage during frequent insertion and removal, and their service life is short. Summary of the Invention

[0005] The technical solution is as follows: An electric toothbrush head includes a brush head connector connected to a brush barrel in a cavity at the lower end of the brush barrel and a bristle portion located at the front end of the brush barrel. The brush head connector has a second connecting cavity in the middle for connecting to an electric toothbrush drive rod. The lower end of the second connecting cavity is an elastic member. A retaining lip for engaging the drive rod is provided on the side of the elastic member that contacts the drive rod. The second connecting cavity is cylindrical in shape. A fastening block is provided at the upper end of the second connecting cavity where it contacts the upper end of the drive rod to prevent rotation of the drive rod.

[0006] Furthermore, the brush head connector is detachably connected to the brush cylinder.

[0007] Even better, the lower end of the brush head connector is recessed inward with a second fixing groove, and two connecting protrusions are provided axially on the outer surface of the brush head connector, the two connecting protrusions being a first protrusion and a second protrusion, respectively; correspondingly, a fixing block adapted to the second fixing groove is provided inside the cavity of the brush cylinder, and a first groove and a second groove adapted to the first protrusion and the second protrusion are provided on the inner cavity of the brush cylinder.

[0008] Furthermore, the bristles on the brush head are arranged in three layers from the center of the brush head outwards.

[0009] Furthermore, the free ends of the bristles on the brush head are configured as pointed tips that facilitate brushing between teeth.

[0010] It should be noted that: The terms "first" and "second" do not represent a specific quantity or order; they are merely used to distinguish the names.

[0011] Compared with existing electric toothbrushes, the electric toothbrush of the present invention has the following advantages: 1. The elastic component of the brush head of this electric toothbrush is located inside the cavity of the toothbrush head. The elastic component is provided with a retaining edge for engaging the drive shaft. During the process of inserting and removing the toothbrush head onto the drive shaft, the retaining edge is only slightly squeezed open by the shaft and then returns to its original position. This design can minimize the deformation of the spring component during the insertion and removal process, thus ensuring a greater number of insertion and removal cycles.

[0012] 2. The cavity of the brush head connector of this brush head has fastening blocks on both sides, which can prevent the drive shaft located inside from rotating.

[0013] 3. The bristles on this toothbrush head are cut into pointed tips by a blade, with the tips pointing in various directions. These pointed tips allow for easier entry into the gaps between teeth and gums for deep cleaning. Attached Figure Description

[0014] Figure 1 This is a perspective view of an electric toothbrush according to an embodiment of the present invention; Figure 2 This is an exploded view of the structure of the electric toothbrush according to an embodiment of the present invention; Figure 3 This is a bottom view of the electric toothbrush according to an embodiment of the present invention; Figure 4 This is a top view of the electric toothbrush according to an embodiment of the present invention; Figure 5 Figure 3 A sectional view of plane AA in the middle; Figure 6 Figure 3 A sectional view of the BB plane; Figure 7 This is a diagram showing the connection status between the motor and the shaft body; Figure 8 This is a structural schematic diagram of the shaft body; Figure 9 This is a schematic diagram of the structure of the light-transmitting outer shell; Figure 10 This is a schematic diagram of the injection mold for the outer casing; Figure 11 This is a schematic diagram of the structure of the bristle section with bristle tips; Figure 12 This is a structural diagram of the bristle connector; Figure 13This is a diagram showing the disassembled state of the brush head; Figure 14 This is a schematic diagram showing the connection status between the shaft body and the brush head; Figure 15 This is a schematic diagram of the internal structure of the brush holder; Explanation of reference numerals in the attached figures: 1. Electric toothbrush; 10. Handle; 101. Outer shell; 1011, Translucent layer; 1012, Light-shielding layer; 10121. Light-transmitting hole; 1013. Anti-slip strips; 102. Internal components; 1021. Motor; 1022. Battery; 1023. PCB board; 10231, LED lights; 1024. Shade; 1025. Movement frame; 1026. Shaft body; 10261, First contact plane; 10262, Second contact plane; 10263, Fastening groove; 10264. First connecting cavity; 10265. Slope; 10266, Slope; 10267. First fixing slot; 103. Switch button; 20. Brush head; 201. Brush holder; 2011, First Groove; 2012, Second Groove; 2013, Fixed Block; 202. Brush part; 2021, bristle tips; 203. Brush head connector; 2031, Second connecting cavity; 2032, Elastic components; 2033, eaves; 2034. Fastening block; 2035, Second fixing slot; 2036, First bump; 2037, Second bump; 2. Mold; 21. Protrusion; Embodiments of the present invention The embodiments of the present invention will be described in detail below.

[0015] like Figures 1 to 6 The electric toothbrush 1 shown includes a handle 10, a brush head 20, and a charging socket 30. The handle 10 includes a housing 101, an internal component 102 disposed inside the housing 101, and a switch button 103 disposed on the housing. The internal component 102 includes a motor frame 1025 and a motor 1021, a battery 1022, and a PCB board 1023 fixed on the motor frame 1025. The brush head 20 includes a brush barrel 201, a brush head connector 203 connected to the lower cavity of the brush barrel 201, and a bristle section 202 located at the head of the brush barrel 201.

[0016] like Figure 3 and Figure 4 As shown, the lower end of the handle 10 is a triangular prism-like structure, and its top tapers inward along the axial direction of the triangular prism to fit the brush head 20. The angle between the bristle plane of the electric toothbrush 1 and one face of the triangular prism is 300-600 degrees. By setting the gripping part of the handle 10 as a triangular prism structure, and ensuring that the bristle plane of the brush head forms an angle of 300-600 degrees with one face of the triangular prism, the user can naturally make the toothbrush bristles contact the teeth at a certain angle when brushing. This effectively corrects the bad brushing habit of brushing with the bristles perpendicular to the tooth surface. When brushing with the bristles parallel to the tooth surface, it is difficult to clean the gaps between teeth and the gingival sulcus. Adjusting the bristle plane to a certain angle with the tooth surface makes it easier to clean the gaps between teeth.

[0017] Preferably, the similar triangular prism is a similar regular triangular prism. Most preferably, the angle between the bristle plane of the electric toothbrush and one face of the triangular prism is 45°. All edges of the similar triangular prism are chamfered, and the lateral faces of the similar triangular prism are curved surfaces convex outwards from the prism. The handle 10 with its regular triangular prism structure ensures that the relative orientation of the toothbrush handle in the user's hand remains unchanged regardless of how the user holds the handle. Combined with human brushing habits, when the brush head plane forms a 45° angle with the front lateral face of the regular triangular prism, it is easier to maintain a close 45° angle between the bristles and teeth during brushing, approximating the Bass brushing technique.

[0018] The brush head and the handle can be an integral structure or a detachable connection structure, with the detachable connection method being preferred. This method saves on usage costs and makes it easier to replace the toothbrush head. The outer surface of the handle is provided with anti-slip strips extending from top to bottom, which effectively prevent the handle from slipping from the palm of the hand.

[0019] like Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 9 , Figure 10 As shown, the handle 10 includes a handle housing 101 and an internal component 102 disposed inside the housing 101. The handle has a light-transmitting display structure for displaying power level and mode position. This structure includes a light-transmitting layer 1011 and a light-shielding layer 1012 on the housing 101. The light-transmitting layer 1011 is the inner layer of the handle and is made of a transparent light-transmitting material. The light-shielding layer is the outer layer of the handle and is made of an opaque material. The light-shielding layer 1012 has a light-transmitting hole 10121, allowing a light source inside the handle to pass through the light-transmitting hole 10121 and be positioned directly above a light source on a PCB board 1023 inside the handle. The light source is preferably an LED lamp 10231.

[0020] Preferably, a light-shielding plate 1024 is further provided between the PCB board 1023 and the housing 101. A light-transmitting hole 10241 is provided on the light-shielding plate 1012 located directly above the light source of the PCB board 1023. The light-transmitting hole 10241 is located directly above the LED lamp 10231, which can effectively guide the light emitted by the LED lamp bead into the light-transmitting hole 10121 on the housing, and at the same time block the interference of light near the light-transmitting hole 10121 on the display effect.

[0021] The method for preparing the light-transmitting outer shell of the electric toothbrush includes the following steps: Step 1: Inject a layer of transparent plastic light-transmitting layer into mold 2; Step two involves injection molding an opaque plastic light-blocking layer onto the surface of the light-transmitting layer from step one.

[0022] Preferably, the plastic light-shielding layer is one or more of pink, gray, blue, and green.

[0023] Ideally, the thickness of the light-transmitting layer is greater than the thickness of the light-shielding layer.

[0024] When performing the injection molding of the light-shielding layer in step two, a protrusion 21 is provided on the mold at the position of the light-transmitting hole 10121. No opaque material needs to be injected here. The designed pit formed at this position on the surface of the light-transmitting layer is the aforementioned light-transmitting hole 10121.

[0025] Royal Philips Electronics Inc. (patentee), December 23, 2011 (application date), CN103281988B (authorization announcement number), invention patent of hidden user interface panel of personal care device and its preparation method (patent name) discloses a light-transmitting panel of electric toothbrush and its preparation method. The light-transmitting display structure disclosed in this patent is to coat the surface of the light-transmitting layer with light-shielding paint, and then laser engrave the light-shielding paint to form light-transmitting holes.

[0026] Philips' patented light-transmitting display structure is complex, involves a complicated manufacturing process, and has high production costs. The light-transmitting display structure disclosed in this invention has the advantages of simple manufacturing process and low cost.

[0027] like Figures 11-15 As shown, the electric toothbrush head 20 includes a brush barrel 201, a brush head connector 203 connected to the lower cavity of the brush head 201, and a bristle portion 202 located at the front end of the brush barrel 201. The middle of the brush head connector 203 is a second connecting cavity 2031 for connecting with the electric toothbrush drive rod. The lower end of the second connecting cavity 2031 is an elastic member 2032. The side of the elastic member 2032 that contacts the drive rod is provided with a retaining lip 2033 for engaging the drive rod. The second connecting cavity 2031 is cylindrical in shape. A fastening block 2034 is provided at the position of the cavity where the upper end of the second connecting cavity 2031 contacts the upper end of the drive rod to prevent the drive rod from rotating.

[0028] Preferably, the brush head connector 203 is detachably connected to the brush cylinder 201.

[0029] The lower end of the brush head connector 203 is recessed inward and has a second fixing groove 2035. Two connecting protrusions are provided axially on the outer surface of the brush head connector 203. The two connecting protrusions are a first protrusion 2036 and a second protrusion 2037, respectively. Correspondingly, the cavity of the brush cylinder 201 is provided with a fixing block 2034 that matches the second fixing groove 2035. The inner cavity of the brush cylinder 201 is provided with a first groove 2011 and a second groove 2012 that match the first protrusion 2036 and the second protrusion 2037.

[0030] The fastening block 2034 is disposed at the front end of the second connecting cavity 2031, located at the position of the two contact planes. The planes in contact with the two contact planes are also planar structures (the two fastening blocks 2034 are respectively located on both sides of the two contact planes). In this way, the shaft body 1026 is clamped between the two fastening blocks 2034, which can prevent the brush head 20 from rotating relative to the shaft body 1026.

[0031] The bristles on the bristle section are arranged in three layers from the center of the bristle section outwards. The free ends of the bristles on the bristle section 202 are set as pointed tips 2021 for easy brushing between teeth.

[0032] The bristles on the brush head 202 are cut into tips with different orientations by a knife. The pointed bristles are more likely to enter the gaps between teeth and gums for cleaning.

[0033] Braun GmbH (Patentee), November 6, 2004 (Application Date), CN1882291B (Authorization Announcement No.), Brush Part for Electric Toothbrush (Patent Title). This patent discloses a brush head for an electric toothbrush, in which a first spring element and a second spring element are arranged inside the brush head cavity to clamp a drive rod in the handle, thereby providing sufficient clamping force between the brush head and the drive rod.

[0034] The brush head disclosed in this invention achieves the connection between the brush head 20 and the handle 10 by engaging the retaining lip 2033 on the elastic member in the cavity with the fastening groove 10263 in the middle part of the drive shaft. Furthermore, inside the cavity of the brush head connector 203, a fastening block 2034 is provided at the position of the two contact planes to prevent the drive rod from rotating.

[0035] like Figures 5-8 As shown, during the insertion of the shaft body 1026 into the cavity of the brush head connector 203, the slope at the front end of the shaft body 1026 acts as a guide. When the shaft body 1026 is pushed forward, the slope 10265 on the first contact plane 10261 contacts the retaining edge 2033 on the elastic member 2032, squeezing the retaining edge 2033 open slightly until the fastening groove 10263 in the middle of the shaft body 1026 slides to the position of the retaining edge 2033. At this time, the retaining edge 2033 returns to its original state and locks the fastening groove 10263 on the shaft body 1026. When the brush head 20 is to be removed from the shaft body 1026, the retaining edge 2033 will slide out along the slope 10266 on the fastening groove 10263, thus facilitating the removal of the brush head.

[0036] During the insertion and removal of the brush head 20, the contact area between the retaining edge 2033 on the elastic member 2032 and the cylindrical surface of the shaft body 1026 is small, so the deformation of the elastic member 2032 is small, which can increase the number of insertions and removals of the brush head (existing toothbrushes will be damaged after a certain number of insertions and removals).

[0037] like Figures 5-8 As shown, the drive rod of the electric toothbrush includes a cylindrical shaft body 1026. The front end of the shaft body 1026 is used to insert the brush head 20, and the rear end is connected to the motor shaft located inside the electric toothbrush handle 10. Two contact planes are arranged parallel to each other at the front end of the shaft body 1026, namely the first contact plane 10261 and the second contact plane. 10262, both of the contact surfaces extend downward from the top of the front end of the shaft, and a fastening groove 10263 is recessed into the middle part of the shaft body 1026.

[0038] The front end of the shaft body 1026 is provided with a slope to facilitate the insertion of the drive rod into the brush head.

[0039] A slope 10265 is provided between the lower ends of the two contact planes and the cylindrical surface of the shaft.

[0040] The fastening groove 10263 and the cylindrical surface of the shaft have a slope structure 10266.

[0041] The rear end of the shaft body 1026 is provided with a first connecting cavity 10264 for connection with the motor along the axial direction of the shaft body 1026.

[0042] A first fixing groove 10267 for fixing the shaft body 1026 is provided on the rear end of the shaft body 1026 below the fastening groove 10263.

[0043] Royal Philips Electronics Inc. (Patentee), December 9, 2008 (Application Date), CN101902986B (Authorization Announcement No.), Brush Head / Handle Interface for Electric Toothbrushes (Patent Title). This patent discloses an electric toothbrush drive shaft, wherein the contact plane at the front end of the drive shaft is provided with a rough structure to increase the torque force between the brush head and the shaft.

[0044] The drive rod disclosed in this invention has a smooth contact surface on its shaft body, which has two main functions: First, it guides the brush head when it is inserted; second, the two contact surfaces give the front end of the cylindrical shaft body a sharp edge, which, together with the clamping of the brush head connector, prevents the brush head from rotating on the shaft body.

[0045] Compared with the drive shaft disclosed by Philips, the drive shaft of this invention has a simpler structure and lower manufacturing cost.

[0046] The above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention; any substitutions and improvements made without departing from the concept of the present invention shall fall within the scope of protection of the present invention.

Claims

1. An electric toothbrush head, comprising a brush barrel, a bristle portion located at the front end of the brush barrel, and a brush head connector connected to a cavity at the lower end of the brush barrel, characterized in that: The middle of the brush head connector is a second connecting cavity for connecting with the electric toothbrush drive rod, and the front end of the drive rod is provided with a contact plane; A fastening block is provided at the position of the cavity where the upper end of the second connecting cavity contacts the upper end of the drive rod to prevent the drive rod from rotating. The fastening block has a contact surface that contacts the drive rod. The contact surface protrudes radially from the lower inner wall of the second connecting cavity along the brush head connector. A transition surface is formed between the contact surface and the lower inner wall. A slope is provided between the lower end of the contact plane of the drive rod and the cylindrical surface of the drive rod. A gap is formed between the slope and the transition surface.

2. The electric toothbrush head according to claim 1, characterized in that: The contact surface between the fastening block and the drive rod is a plane or an arc-shaped surface.

3. The electric toothbrush head according to claim 1, characterized in that: The number of fastening blocks is at least two, and the at least two fastening blocks include a first fastening block and a second fastening block, wherein the second fastening block is located in a circumferential position opposite to or adjacent to the first fastening block.

4. The electric toothbrush head according to claim 3, characterized in that: The contact surface between the first fastening block and the drive rod is a plane, and / or the contact surface between the second fastener and the drive rod is a plane.

5. The electric toothbrush head according to claim 1, characterized in that: The second connecting cavity is provided with an elastic member, and the side of the elastic member that contacts the drive rod is provided with a retaining edge for engaging the drive rod. The retaining edge is located at the lower end of the elastic member.

6. The electric toothbrush head according to claim 5, characterized in that: The elastic member is independently disposed within the inner circumferential surface of the brush head connector, and there is a gap between the outer surface of the elastic member and the inner surface of the adjacent brush head connector along the radial direction of the brush head connector.

7. The electric toothbrush head according to claim 5, characterized in that: The ferrule is located at the lower end of the brush head connector.

8. The electric toothbrush head according to claim 5, characterized in that: The elastic member has a reinforcing structure on its outer side.

9. The electric toothbrush head according to claim 8, characterized in that: The reinforcing structure is located on the side of the elastic member away from the drive rod.

10. The electric toothbrush head according to claim 1, characterized in that: The second connecting cavity is cylindrical in shape.

11. The electric toothbrush head according to claim 1, characterized in that: The bristle section includes multiple bristle bundles, and each bristle bundle includes bristles of at least two different heights.

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